The following information is obtained from two independent samples selected from two populations.
n1 =650 ¯x1 =1.05 σ1 =5.22
n2 =675 ¯x2 =1.54 σ2 =6.80
a. In selecting which version of the z/t test of means to use, consider the sample size and whether you are given the population or sample standard deviations. Given the data above, will you use a z or t test?
b. What is the value of z? Round to two decimal places.
c. Would you reject the null hypothesis? YES or NO